Black Decker Inc.

William F Hilsher

Bhanuprasad V Gorti

Shailesh P Waikar

Uday S Deshpande

Daniel Puzio

Daniele C Brotto

Craig Alan Schell

David L Wikle

Qiang J Zhang

Jason R Melvin

Charles L Bradenbaugh

Gregory A Rice

Joshua D West

Uday Deshpande

Shailesh P Waiker

Qiang Zhang

A control system is provided for use in a power tool. The control system includes: a rotational rate sensor having a resonating mass and a controller electrically connected to the rotational rate sensor. The rotational rate sensor detects lateral displacement of the resonating mass and generates a signal indicative of the detected lateral displacement, such that the lateral displacement is directly proportional to a rotational speed at which the power tool rotates about an axis of the rotary shaft. Based on the generated signal, the controller initiates a protective operation to avoid further undesirable rotation of the power tool. The control scheme employed by the power tool may initiate different protective operations for different tool conditions.

Power tool anti-kickback system with rotational rate sensor

A hand held orbital sander has a housing having an electronically commutated motor disposed therein and an orbit mechanism disposed beneath the housing. A motor controller is coupled to the motor. The motor controller changes the speed of at which it runs the motor from an idle speed to a sanding speed upon the motor speed dropping from idle speed to an idle speed threshold value and changes the speed at which it runs the motor from sanding speed to idle speed upon the motor speed increasing from sanding speed to a sanding speed threshold value. The sander may have a mechanical brake that brakes the orbit mechanism and the motor controller also dynamically brakes the motor.

Electric sander and motor control therefor

A power tool is a 'low profile' power tool, that is the overall height of the power tool is sufficiently small that a user can grasp the top of the power tool with the user's hand and the hand will be positioned relative close to the bottom of the power tool compared with existing power tools. The low profile power tool uses a low profile motor having a diameter to lamination height ratio of at least 2:1. In an aspect of the invention, the motor is an electronically commutated 'pancake' style motor. In an aspect of the invention, the power tool is a random orbital sander or an orbital sander having a motor that provides at least 40 watts of power. In an aspect of the invention, the sander has a mechanical brake that brakes the orbital mechanism and the motor is dynamically braked.

Low profile electric sander

A driving tool, such as a fastening tool, with a driver, a motor, a flywheel driven by the motor, an actuator, an actuator member that is movable by the actuator, a trigger switch that is moveable by a trigger between an unactuated state and an actuated state, and a contact trip switch that is moveable by a contact trip between an unactuated state and an actuated state. The controller does not include power switches for controlling the operation of the motor and the actuator, but rather employs microswitches and control logic to determine when to activate the motor assembly and the actuator.

Electronic fastening tool

A battery charger for simultaneously charging a plurality of batteries from a single power source includes a microcontroller-based circuit that is programmed to multiplex full charging current sequentially to each battery in the charger. Charge termination in the preferred embodiment is determined by monitoring total charge time and by detecting a predetermined drop in battery voltage--i.e., 'minus .DELTA.V'. The microcontroller is programmed to individually track the actual charge time of each battery in the charger and to adjust the clock rate of each battery accordingly when multiple batteries are charged at the same time. In addition, the minus .DELTA.V charge termination criteria is temporarily disabled for any battery in the charging process when one or more batteries are inserted into the charger to prevent erroneous detection of a full charge condition.

Battery Charger and method for simultaneously charging multiple

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Parkville, MD, United States of America

William F Hilsher